Re^2: Perl-Gtk2::How to set a window background image.

[turo]

I was very upset and discouraged ... and when i was resigned to open and xpm image, load it to a pixmap, and then load it with the Gtk2::RcStyle as a background image ...
when i received your reply ...
The use of an XPM hardcoded into an array was like a deją vu ... I took my last breath and said i'm going to make the last effort ... and an hour after ... tachan!!!!!

I can load any image (jpeg, png ... and all those supported by the gdkPixbuf) to a background. Here is the code, modified from the one you submitted (i've only change the set_bg function ...)

#!/usr/bin/perl
use warnings;
use strict;
use Glib qw/TRUE FALSE/;
use Gtk2 '-init';

 my $rc_style = Gtk2::RcStyle->new;
 $rc_style->bg_pixmap_name('normal', 'bunny.xpm');

my $window = Gtk2::Window->new('toplevel');
$window->set_title('Embed test');
$window ->signal_connect( 'destroy' => \&delete_event );
$window->set_border_width(10);
$window->set_size_request(500,500);

$window->modify_style ($rc_style);


my $vbox = Gtk2::VBox->new( FALSE, 6 );
$window->add($vbox);
$vbox->set_border_width(2);

my $hbox= Gtk2::HBox->new( FALSE, 6 );
$vbox->pack_end($hbox,FALSE,FALSE,0);
$hbox->set_border_width(2);

$vbox->pack_end (Gtk2::HSeparator->new, FALSE, FALSE, 0);

my $button = Gtk2::Button->new_from_stock('gtk-quit');
$hbox->pack_end( $button, FALSE, FALSE, 0 );
$button->signal_connect( clicked => \&delete_event );

my $button1 = Gtk2::Button->new('Set BG');
$hbox->pack_end( $button1, FALSE, FALSE, 0 );
$button1->signal_connect( clicked => \&set_bg );

my $vbox1 = Gtk2::VBox->new( 0, 5 );
$vbox->pack_end ($vbox1, TRUE, TRUE, 0);


my $btn = Gtk2::Button->new_from_stock('gtk-quit');
$btn->signal_connect( 'clicked' => \&delete_event );

$window->show_all();
Gtk2->main;
#####################################
sub delete_event {
Gtk2->main_quit;
return FALSE;
}  



####
sub set_bg{
#### PNG & Pixbuff :-)
my $values;
my ($widget, $context, @other_params) = @_;
my $colormap = $window->get_default_colormap;
my $pixbuff  = Gtk2::Gdk::Pixbuf->new_from_file("figure.png");
my $graphicContext = Gtk2::GC->get(Gtk2::Gdk::Visual->get_best_depth,
                                   $colormap,
                                   $values);
$pixbuff->render_to_drawable($widget->get_parent_window,
                             $graphicContext,
                             0,0,0,0,500,500,'normal',0,0);
}

The conclusion, is:
In X11 programming, you can draw anything to any 'drawable' window (i'm not an expert, but this is correct), With the help of Gtk2::Widget::get_parent_window we obtain a Gtk2::Gdk::Window which is a Gtk2::Gdk::Drawable. Once we got a drawable window, i think we can do almost anything with it (low level :') ... and low docummented)

Okay, alls seems to be fine, but i have other problem now; how i obtain a Gtk2::Gdk::Window without waiting to the execution of the callback function? ... We need a kind of casting function!!!! ... Ideas?


Cheers
turo



(... thanks zentara!!! ...)

[zentara]

Hi, I think you are on the right track. I was experimenting with a Drawable area. I tried your code, but I am getting segmentation faults. :-( I'm using Gtk+2.8.11. Anyways, I will experiment with your code, and hope I can get it to go.

Alot of the problem, is the non-intuitive nature of the Gtk2 objects, somethings can be written on, and somethings are only containers. It might be smart of you to ask muppet on the gtk-perl maillist. If anyone knows, it would be him.